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Date:   Fri, 14 Aug 2020 20:05:41 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Tanmay Shah <tanmay@...eaurora.org>, swboyd@...omium.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com
Cc:     linux-kernel@...r.kernel.org, freedreno@...ts.freedesktop.org,
        seanpaul@...omium.org, daniel@...ll.ch, airlied@...ux.ie,
        aravindh@...eaurora.org, abhinavk@...eaurora.org,
        khsieh@...eaurora.org, Chandan Uddaraju <chandanu@...eaurora.org>,
        Vara Reddy <varar@...eaurora.org>
Subject: Re: [PATCH v10 3/5] drm/msm/dp: add support for DP PLL driver


On 12/08/2020 07:42, Tanmay Shah wrote:
 > From: Chandan Uddaraju <chandanu@...eaurora.org>
 >
 > Add the needed DP PLL specific files to support
 > display port interface on msm targets.

[skipped]

 > diff --git a/drivers/gpu/drm/msm/dp/dp_pll_private.h 
b/drivers/gpu/drm/msm/dp/dp_pll_private.h
 > new file mode 100644
 > index 000000000000..475ba6ed59ab
 > --- /dev/null
 > +++ b/drivers/gpu/drm/msm/dp/dp_pll_private.h
 > @@ -0,0 +1,98 @@
 > +/* SPDX-License-Identifier: GPL-2.0-only */
 > +/*
 > + * Copyright (c) 2016-2020, The Linux Foundation. All rights reserved.
 > + */
 > +
 > +#ifndef __DP_PLL_10NM_H
 > +#define __DP_PLL_10NM_H
 > +
 > +#include "dp_pll.h"
 > +#include "dp_reg.h"
 > +
 > +#define DP_VCO_HSCLK_RATE_1620MHZDIV1000    1620000UL
 > +#define DP_VCO_HSCLK_RATE_2700MHZDIV1000    2700000UL
 > +#define DP_VCO_HSCLK_RATE_5400MHZDIV1000    5400000UL
 > +#define DP_VCO_HSCLK_RATE_8100MHZDIV1000    8100000UL
 > +
 > +#define NUM_DP_CLOCKS_MAX            6
 > +
 > +#define DP_PHY_PLL_POLL_SLEEP_US        500
 > +#define DP_PHY_PLL_POLL_TIMEOUT_US        10000
 > +
 > +#define DP_VCO_RATE_8100MHZDIV1000        8100000UL
 > +#define DP_VCO_RATE_9720MHZDIV1000        9720000UL
 > +#define DP_VCO_RATE_10800MHZDIV1000        10800000UL
 > +
 > +struct dp_pll_vco_clk {
 > +    struct clk_hw hw;
 > +    unsigned long    rate;        /* current vco rate */
 > +    u64        min_rate;    /* min vco rate */
 > +    u64        max_rate;    /* max vco rate */
 > +    void        *priv;
 > +};
 > +
 > +struct dp_pll_db {

This struct should probably go into dp_pll_10nm.c. dp_pll_7nm.c, for 
example, will use slightly different structure.

 > +    struct msm_dp_pll *base;
 > +
 > +    int id;
 > +    struct platform_device *pdev;
 > +
 > +    /* private clocks: */
 > +    bool fixed_factor_clk[NUM_DP_CLOCKS_MAX];
 > +    struct clk_hw *hws[NUM_DP_CLOCKS_MAX];

Then these two fields can use exact number of clocks rather than 
NUM_DP_CLOCKS_MAX.

 > +    u32 num_hws;
 > +
 > +    /* lane and orientation settings */
 > +    u8 lane_cnt;
 > +    u8 orientation;
 > +
 > +    /* COM PHY settings */
 > +    u32 hsclk_sel;
 > +    u32 dec_start_mode0;
 > +    u32 div_frac_start1_mode0;
 > +    u32 div_frac_start2_mode0;
 > +    u32 div_frac_start3_mode0;
 > +    u32 integloop_gain0_mode0;
 > +    u32 integloop_gain1_mode0;
 > +    u32 vco_tune_map;
 > +    u32 lock_cmp1_mode0;
 > +    u32 lock_cmp2_mode0;
 > +    u32 lock_cmp3_mode0;
 > +    u32 lock_cmp_en;
 > +
 > +    /* PHY vco divider */
 > +    u32 phy_vco_div;
 > +    /*
 > +     * Certain pll's needs to update the same vco rate after resume in
 > +     * suspend/resume scenario. Cached the vco rate for such plls.
 > +     */
 > +    unsigned long    vco_cached_rate;
 > +    u32        cached_cfg0;
 > +    u32        cached_cfg1;
 > +    u32        cached_outdiv;
 > +
 > +    uint32_t index;
 > +};
 > +
 > +static inline struct dp_pll_vco_clk *to_dp_vco_hw(struct clk_hw *hw)
 > +{
 > +    return container_of(hw, struct dp_pll_vco_clk, hw);
 > +}
 > +
 > +#define to_msm_dp_pll(vco) ((struct msm_dp_pll *)vco->priv)
 > +
 > +#define to_dp_pll_db(x)    ((struct dp_pll_db *)x->priv)
 > +
 > +int dp_vco_set_rate_10nm(struct clk_hw *hw, unsigned long rate,
 > +                unsigned long parent_rate);
 > +unsigned long dp_vco_recalc_rate_10nm(struct clk_hw *hw,
 > +                unsigned long parent_rate);
 > +long dp_vco_round_rate_10nm(struct clk_hw *hw, unsigned long rate,
 > +                unsigned long *parent_rate);
 > +int dp_vco_prepare_10nm(struct clk_hw *hw);
 > +void dp_vco_unprepare_10nm(struct clk_hw *hw);
 > +
 > +int msm_dp_pll_10nm_init(struct msm_dp_pll *dp_pll, int id);
 > +void msm_dp_pll_10nm_deinit(struct msm_dp_pll *dp_pll);

These functions don't seem to be used outside of dp_pll_10nm. What about 
making them static?


-- 
With best wishes
Dmitry

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